Mine shot everything well, I BELIEVE it's a 10", but will handle all 55-100, and 105 Speers FWIW. Try 85 Sierra BTHP, 87 Hornady HPs, 95 BTips.
My Forester shot about as good as a later AII sporter, outstanding.
Latter shot 60 HPs atop H414 into half inch groups, and 100 Red Box Federals, OLD stuff, 5 of 7 shots into 1.1" IIRC at 200 yds, using a 4x32 Balfor.
What's your game? Varmints? Deer?
I settled on 95 BTs for my 6mmBR Dakota that had a 10 twist, put them into 5/8" at 200 yds and deer did not like them. It and the Barnes 80 TTSX and 85 TSX are my top choices in any 6mm for deer/hog sized game.
As above, a good 243 like Sako's can shoot as well with a 60 as a 100 grain. Pick your poison and IME IMR4350 shot great w/ALL bullets from 70-100, though Varget w/70s does well also, and if you do want to shoot the itsy bitsy 55-60s, go w/a full case of H414.
Fed and WW brass will usually edge out RP on accuracy IME.
